Mike Prince Hi Mike I have noticed I have mistakenly and unknowingly deleted some species from my world list. Can these be detected and therefore breinserted?

Mike Prince. Hi Mike I have noticed when inserting new species to my world list I have occassionally mistakenly and unknowingly deleted some other species from my list. I have unwiitingly dragged the cursor over the delete box and deleted other species. Can these deleted nspecies be located and reinserted? This has happened over a space of time. Hoping you can help?
David Branagh